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| 304 | classes·that·are·associated·in·a·many-to-many·pattern.</p> | 304 | classes·that·are·associated·in·a·many-to-many·pattern.</p> |
| 305 | <p>Listing·of·files:<ul·class="simple"> | 305 | <p>Listing·of·files:<ul·class="simple"> |
| 306 | <li><p><p><a·class="reference·external"·href="../_modules/examples/association/dict_of_sets_with_default.html">dict_of_sets_with_default.py</a>·-·An·advanced·association·proxy·example·which | 306 | <li><p><p><a·class="reference·external"·href="../_modules/examples/association/dict_of_sets_with_default.html">dict_of_sets_with_default.py</a>·-·An·advanced·association·proxy·example·which |
| 307 | illustrates·nesting·of·association·proxies·to·produce·multi-level·Python | 307 | illustrates·nesting·of·association·proxies·to·produce·multi-level·Python |
| 308 | collections,·in·this·case·a·dictionary·with·string·keys·and·sets·of·integers | 308 | collections,·in·this·case·a·dictionary·with·string·keys·and·sets·of·integers |
| 309 | as·values,·which·conceal·the·underlying·mapped·classes.</p> | 309 | as·values,·which·conceal·the·underlying·mapped·classes.</p> |
| 310 | </p></li> | 310 | </p></li> |
| 311 | <li><p><p><a·class="reference·external"·href="../_modules/examples/association/proxied_association.html">proxied_association.py</a>·-·Same·example·as·basic_association,·adding·in | ||
| 312 | usage·of·<a·class="reference·internal"·href="extensions/associationproxy.html#module-sqlalchemy.ext.associationproxy"·title="sqlalchemy.ext.associationproxy"><code·class="xref·py·py-mod·docutils·literal·notranslate"><span·class="pre">sqlalchemy.ext.associationproxy</span></code></a>·to·make·explicit·references | ||
| 313 | to·<code·class="docutils·literal·notranslate"><span·class="pre">OrderItem</span></code>·optional.</p> | ||
| 314 | </p></li> | ||
| 315 | <li><p><p><a·class="reference·external"·href="../_modules/examples/association/basic_association.html">basic_association.py</a>·-·Illustrate·a·many-to-many·relationship·between·an | 311 | <li><p><p><a·class="reference·external"·href="../_modules/examples/association/basic_association.html">basic_association.py</a>·-·Illustrate·a·many-to-many·relationship·between·an |
| 316 | “Order”·and·a·collection·of·“Item”·objects,·associating·a·purchase·price | 312 | “Order”·and·a·collection·of·“Item”·objects,·associating·a·purchase·price |
| 317 | with·each·via·an·association·object·called·“OrderItem”</p> | 313 | with·each·via·an·association·object·called·“OrderItem”</p> |
| 318 | </p></li> | 314 | </p></li> |
| 315 | <li><p><p><a·class="reference·external"·href="../_modules/examples/association/proxied_association.html">proxied_association.py</a>·-·Same·example·as·basic_association,·adding·in | ||
| 316 | usage·of·<a·class="reference·internal"·href="extensions/associationproxy.html#module-sqlalchemy.ext.associationproxy"·title="sqlalchemy.ext.associationproxy"><code·class="xref·py·py-mod·docutils·literal·notranslate"><span·class="pre">sqlalchemy.ext.associationproxy</span></code></a>·to·make·explicit·references | ||
| 317 | to·<code·class="docutils·literal·notranslate"><span·class="pre">OrderItem</span></code>·optional.</p> | ||
| 318 | </p></li> | ||
| 319 | </ul> | 319 | </ul> |
| 320 | </p> | 320 | </p> |
| 321 | </section> | 321 | </section> |
| 322 | <section·id="module-examples.asyncio"> | 322 | <section·id="module-examples.asyncio"> |
| 323 | <span·id="asyncio-integration"></span><span·id="examples-asyncio"></span><h3>Asyncio·Integration<a·class="headerlink"·href="#module-examples.asyncio"·title="Link·to·this·heading">¶</a></h3> | 323 | <span·id="asyncio-integration"></span><span·id="examples-asyncio"></span><h3>Asyncio·Integration<a·class="headerlink"·href="#module-examples.asyncio"·title="Link·to·this·heading">¶</a></h3> |
| 324 | <p>Examples·illustrating·the·asyncio·engine·feature·of·SQLAlchemy.</p> | 324 | <p>Examples·illustrating·the·asyncio·engine·feature·of·SQLAlchemy.</p> |
| 325 | <p>Listing·of·files:<ul·class="simple"> | 325 | <p>Listing·of·files:<ul·class="simple"> |
| 326 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/async_orm.html">async_orm.py</a>·-·Illustrates·use·of·the·<code·class="docutils·literal·notranslate"><span·class="pre">sqlalchemy.ext.asyncio.AsyncSession</span></code>·object | ||
| 327 | for·asynchronous·ORM·use.</p> | ||
| 328 | </p></li> | ||
| 329 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/greenlet_orm.html">greenlet_orm.py</a>·-·Illustrates·use·of·the·sqlalchemy.ext.asyncio.AsyncSession·object | ||
| 330 | for·asynchronous·ORM·use,·including·the·optional·run_sync()·method.</p> | ||
| 331 | </p></li> | ||
| 326 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/gather_orm_statements.html">gather_orm_statements.py</a>·-·Illustrates·how·to·run·many·statements·concurrently·using·<code·class="docutils·literal·notranslate"><span·class="pre">asyncio.gather()</span></code> | 332 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/gather_orm_statements.html">gather_orm_statements.py</a>·-·Illustrates·how·to·run·many·statements·concurrently·using·<code·class="docutils·literal·notranslate"><span·class="pre">asyncio.gather()</span></code> |
| 327 | along·many·asyncio·database·connections,·merging·ORM·results·into·a·single | 333 | along·many·asyncio·database·connections,·merging·ORM·results·into·a·single |
| 328 | <code·class="docutils·literal·notranslate"><span·class="pre">AsyncSession</span></code>.</p> | 334 | <code·class="docutils·literal·notranslate"><span·class="pre">AsyncSession</span></code>.</p> |
| 329 | </p></li> | 335 | </p></li> |
| 330 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/async_orm.html">async_orm.py</a>·-·Illustrates·use·of·the·<code·class="docutils·literal·notranslate"><span·class="pre">sqlalchemy.ext.asyncio.AsyncSession</span></code>·object | ||
| 331 | for·asynchronous·ORM·use.</p> | ||
| 332 | </p></li> | ||
| 333 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/async_orm_writeonly.html">async_orm_writeonly.py</a>·-·Illustrates·using·<strong>write·only·relationships</strong>·for·simpler·handling | 336 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/async_orm_writeonly.html">async_orm_writeonly.py</a>·-·Illustrates·using·<strong>write·only·relationships</strong>·for·simpler·handling |
| 334 | of·ORM·collections·under·asyncio.</p> | 337 | of·ORM·collections·under·asyncio.</p> |
| 335 | </p></li> | 338 | </p></li> |
| 336 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/basic.html">basic.py</a>·-·Illustrates·the·asyncio·engine·/·connection·interface.</p> | 339 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/basic.html">basic.py</a>·-·Illustrates·the·asyncio·engine·/·connection·interface.</p> |
| 337 | </p></li> | 340 | </p></li> |
| 338 | <li><p><p><a·class="reference·external"·href="../_modules/examples/asyncio/greenlet_orm.html">greenlet_orm.py</a>·-·Illustrates·use·of·the·sqlalchemy.ext.asyncio.AsyncSession·object | ||
| 339 | for·asynchronous·ORM·use,·including·the·optional·run_sync()·method.</p> | ||
| 340 | </p></li> | ||
| 341 | </ul> | 341 | </ul> |
| 342 | </p> | 342 | </p> |
| 343 | </section> | 343 | </section> |
| 344 | <section·id="module-examples.graphs"> | 344 | <section·id="module-examples.graphs"> |
| 345 | <span·id="directed-graphs"></span><h3>Directed·Graphs<a·class="headerlink"·href="#module-examples.graphs"·title="Link·to·this·heading">¶</a></h3> | 345 | <span·id="directed-graphs"></span><h3>Directed·Graphs<a·class="headerlink"·href="#module-examples.graphs"·title="Link·to·this·heading">¶</a></h3> |
| 346 | <p>An·example·of·persistence·for·a·directed·graph·structure.···The | 346 | <p>An·example·of·persistence·for·a·directed·graph·structure.···The |
| 347 | graph·is·stored·as·a·collection·of·edges,·each·referencing·both·a | 347 | graph·is·stored·as·a·collection·of·edges,·each·referencing·both·a |
| Offset 378, 31 lines modified | Offset 378, 31 lines modified | ||
| 378 | subclassing·the·<code·class="docutils·literal·notranslate"><span·class="pre">HasAddresses</span></code>·mixin,·which·ensures·that·the | 378 | subclassing·the·<code·class="docutils·literal·notranslate"><span·class="pre">HasAddresses</span></code>·mixin,·which·ensures·that·the |
| 379 | parent·class·is·provided·with·an·<code·class="docutils·literal·notranslate"><span·class="pre">addresses</span></code>·collection | 379 | parent·class·is·provided·with·an·<code·class="docutils·literal·notranslate"><span·class="pre">addresses</span></code>·collection |
| 380 | which·contains·<code·class="docutils·literal·notranslate"><span·class="pre">Address</span></code>·objects.</p> | 380 | which·contains·<code·class="docutils·literal·notranslate"><span·class="pre">Address</span></code>·objects.</p> |
| 381 | <p>The·<a·class="reference·external"·href="../_modules/examples/generic_associations/discriminator_on_association.html">discriminator_on_association.py</a>·and·<a·class="reference·external"·href="../_modules/examples/generic_associations/generic_fk.html">generic_fk.py</a>·scripts | 381 | <p>The·<a·class="reference·external"·href="../_modules/examples/generic_associations/discriminator_on_association.html">discriminator_on_association.py</a>·and·<a·class="reference·external"·href="../_modules/examples/generic_associations/generic_fk.html">generic_fk.py</a>·scripts |
| 382 | are·modernized·versions·of·recipes·presented·in·the·2007·blog·post | 382 | are·modernized·versions·of·recipes·presented·in·the·2007·blog·post |
| 383 | <a·class="reference·external"·href="https://techspot.zzzeek.org/2007/05/29/polymorphic-associations-with-sqlalchemy/">Polymorphic·Associations·with·SQLAlchemy</a>.</p> | 383 | <a·class="reference·external"·href="https://techspot.zzzeek.org/2007/05/29/polymorphic-associations-with-sqlalchemy/">Polymorphic·Associations·with·SQLAlchemy</a>.</p> |
| 384 | <p>Listing·of·files:<ul·class="simple"> | 384 | <p>Listing·of·files:<ul·class="simple"> |
| 385 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/table_per_related.html">table_per_related.py</a>·-·Illustrates·a·generic·association·which·persists·association | ||
| 386 | objects·within·individual·tables,·each·one·generated·to·persist | ||
| 387 | those | 385 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/discriminator_on_association.html">discriminator_on_association.py</a>·-·Illustrates·a·mixin·which·provides·a·generic·association |
| 386 | using·a·single·target·table·and·a·single·association·table, | ||
| 387 | referred·to·by·all·parent·tables.··The·association·table | ||
| 388 | contains·a·“discriminator”·column·which·determines·what·type·of | ||
| 389 | parent·object·associates·to·each·particular·row·in·the·association | ||
| 390 | table.</p> | ||
| 388 | </p></li> | 391 | </p></li> |
| 389 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/generic_fk.html">generic_fk.py</a>·-·Illustrates·a·so-called·“generic·foreign·key”,·in·a·similar·fashion | 392 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/generic_fk.html">generic_fk.py</a>·-·Illustrates·a·so-called·“generic·foreign·key”,·in·a·similar·fashion |
| 390 | to·that·of·popular·frameworks·such·as·Django,·ROR,·etc.··This | 393 | to·that·of·popular·frameworks·such·as·Django,·ROR,·etc.··This |
| 391 | approach·bypasses·standard·referential·integrity | 394 | approach·bypasses·standard·referential·integrity |
| 392 | practices,·in·that·the·“foreign·key”·column·is·not·actually | 395 | practices,·in·that·the·“foreign·key”·column·is·not·actually |
| 393 | constrained·to·refer·to·any·particular·table;·instead, | 396 | constrained·to·refer·to·any·particular·table;·instead, |
| 394 | in-application·logic·is·used·to·determine·which·table·is·referenced.</p> | 397 | in-application·logic·is·used·to·determine·which·table·is·referenced.</p> |
| 395 | </p></li> | 398 | </p></li> |
| 399 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/table_per_related.html">table_per_related.py</a>·-·Illustrates·a·generic·association·which·persists·association | ||
| 400 | objects·within·individual·tables,·each·one·generated·to·persist | ||
| 401 | those·objects·on·behalf·of·a·particular·parent·class.</p> | ||
| 396 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/discriminator_on_association.html">discriminator_on_association.py</a>·-·Illustrates·a·mixin·which·provides·a·generic·association | ||
| 397 | using·a·single·target·table·and·a·single·association·table, | ||
| 398 | referred·to·by·all·parent·tables.··The·association·table | ||
| 399 | contains·a·“discriminator”·column·which·determines·what·type·of | ||
| 400 | parent·object·associates·to·each·particular·row·in·the·association | ||
| 401 | table.</p> | ||
| 402 | </p></li> | 402 | </p></li> |
| 403 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/table_per_association.html">table_per_association.py</a>·-·Illustrates·a·mixin·which·provides·a·generic·association | 403 | <li><p><p><a·class="reference·external"·href="../_modules/examples/generic_associations/table_per_association.html">table_per_association.py</a>·-·Illustrates·a·mixin·which·provides·a·generic·association |
| 404 | via·a·individually·generated·association·tables·for·each·parent·class. | 404 | via·a·individually·generated·association·tables·for·each·parent·class. |
| 405 | The·associated·objects·themselves·are·persisted·in·a·single·table | 405 | The·associated·objects·themselves·are·persisted·in·a·single·table |
| 406 | shared·among·all·parents.</p> | 406 | shared·among·all·parents.</p> |
| 407 | </p></li> | 407 | </p></li> |
| 408 | </ul> | 408 | </ul> |
| Offset 477, 32 lines modified | Offset 477, 32 lines modified | ||
| 477 | <div·class="admonition·seealso"> | 477 | <div·class="admonition·seealso"> |
| 478 | <p·class="admonition-title">See·also</p> | 478 | <p·class="admonition-title">See·also</p> |
| 479 | <p><a·class="reference·internal"·href="../faq/performance.html#faq-how-to-profile"><span·class="std·std-ref">How·can·I·profile·a·SQLAlchemy·powered·application?</span></a></p> | 479 | <p><a·class="reference·internal"·href="../faq/performance.html#faq-how-to-profile"><span·class="std·std-ref">How·can·I·profile·a·SQLAlchemy·powered·application?</span></a></p> |
| 480 | </div> | 480 | </div> |
| 481 | <section·id="file-listing"> | 481 | <section·id="file-listing"> |
| 482 | <h4>File·Listing<a·class="headerlink"·href="#file-listing"·title="Link·to·this·heading">¶</a></h4> | 482 | <h4>File·Listing<a·class="headerlink"·href="#file-listing"·title="Link·to·this·heading">¶</a></h4> |
| 483 | <p>Listing·of·files:<ul·class="simple"> | 483 | <p>Listing·of·files:<ul·class="simple"> |
| 484 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/bulk_updates.html">bulk_updates.py</a>·-·This·series·of·tests·will·illustrate·different·ways·to·UPDATE·a·large·number | ||
| 485 | of·rows·in·bulk·(under·construction!·there’s·just·one·test·at·the·moment)</p> | ||
| 486 | </p></li> | ||
| 487 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/single_inserts.html">single_inserts.py</a>·-·In·this·series·of·tests,·we’re·looking·at·a·method·that·inserts·a·row | 484 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/single_inserts.html">single_inserts.py</a>·-·In·this·series·of·tests,·we’re·looking·at·a·method·that·inserts·a·row |
| 488 | within·a·distinct·transaction,·and·afterwards·returns·to·essentially·a | 485 | within·a·distinct·transaction,·and·afterwards·returns·to·essentially·a |
| 489 | “closed”·state.···This·would·be·analogous·to·an·API·call·that·starts·up | 486 | “closed”·state.···This·would·be·analogous·to·an·API·call·that·starts·up |
| 490 | a·database·connection,·inserts·the·row,·commits·and·closes.</p> | 487 | a·database·connection,·inserts·the·row,·commits·and·closes.</p> |
| 491 | </p></li> | 488 | </p></li> |
| 489 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/short_selects.html">short_selects.py</a>·-·This·series·of·tests·illustrates·different·ways·to·SELECT·a·single | ||
| 490 | record·by·primary·key</p> | ||
| 491 | </p></li> | ||
| 492 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/bulk_inserts.html">bulk_inserts.py</a>·-·This·series·of·tests·illustrates·different·ways·to·INSERT·a·large·number | 492 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/bulk_inserts.html">bulk_inserts.py</a>·-·This·series·of·tests·illustrates·different·ways·to·INSERT·a·large·number |
| 493 | of·rows·in·bulk.</p> | 493 | of·rows·in·bulk.</p> |
| 494 | </p></li> | 494 | </p></li> |
| 495 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/ | 495 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/bulk_updates.html">bulk_updates.py</a>·-·This·series·of·tests·will·illustrate·different·ways·to·UPDATE·a·large·number |
| 496 | of· | 496 | of·rows·in·bulk·(under·construction!·there’s·just·one·test·at·the·moment)</p> |
| 497 | </p></li> | 497 | </p></li> |
| 498 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/__main__.html">__main__.py</a>·-·Allows·the·examples/performance·package·to·be·run·as·a·script.</p> | 498 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/__main__.html">__main__.py</a>·-·Allows·the·examples/performance·package·to·be·run·as·a·script.</p> |
| 499 | </p></li> | 499 | </p></li> |
| 500 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/short_selects.html">short_selects.py</a>·-·This·series·of·tests·illustrates·different·ways·to·SELECT·a·single | ||
| 501 | rec | 500 | <li><p><p><a·class="reference·external"·href="../_modules/examples/performance/large_resultsets.html">large_resultsets.py</a>·-·In·this·series·of·tests,·we·are·looking·at·time·to·load·a·large·number |
| 501 | of·very·small·and·simple·rows.</p> | ||
| 502 | </p></li> | 502 | </p></li> |
| 503 | </ul> | 503 | </ul> |
| 504 | </p> | 504 | </p> |
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| 100 | intermediary·class·mediates·the·relationship·between·two·classes·that·are | 100 | intermediary·class·mediates·the·relationship·between·two·classes·that·are |
| 101 | associated·in·a·many-to-many·pattern. | 101 | associated·in·a·many-to-many·pattern. |
| 102 | Listing·of·files: | 102 | Listing·of·files: |
| 103 | ····*·_\x8d_\x8i_\x8c_\x8t_\x8__\x8o_\x8f_\x8__\x8s_\x8e_\x8t_\x8s_\x8__\x8w_\x8i_\x8t_\x8h_\x8__\x8d_\x8e_\x8f_\x8a_\x8u_\x8l_\x8t_\x8._\x8p_\x8y·-·An·advanced·association·proxy·example | 103 | ····*·_\x8d_\x8i_\x8c_\x8t_\x8__\x8o_\x8f_\x8__\x8s_\x8e_\x8t_\x8s_\x8__\x8w_\x8i_\x8t_\x8h_\x8__\x8d_\x8e_\x8f_\x8a_\x8u_\x8l_\x8t_\x8._\x8p_\x8y·-·An·advanced·association·proxy·example |
| 104 | ······which·illustrates·nesting·of·association·proxies·to·produce·multi-level | 104 | ······which·illustrates·nesting·of·association·proxies·to·produce·multi-level |
| 105 | ······Python·collections,·in·this·case·a·dictionary·with·string·keys·and·sets | 105 | ······Python·collections,·in·this·case·a·dictionary·with·string·keys·and·sets |
| 106 | ······of·integers·as·values,·which·conceal·the·underlying·mapped·classes. | 106 | ······of·integers·as·values,·which·conceal·the·underlying·mapped·classes. |
| 107 | _\x8p_\x8r_\x8o_\x8x_\x8i_\x8e_\x8d_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·-·Same·example·as·basic_association,·adding·in·usage·of | ||
| 108 | _\x8s_\x8q_\x8l_\x8a_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y_\x8._\x8e_\x8x_\x8t_\x8._\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8p_\x8r_\x8o_\x8x_\x8y·to·make·explicit·references·to·OrderItem | ||
| 109 | optional. | ||
| 110 | _\x8b_\x8a_\x8s_\x8i_\x8c_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·-·Illustrate·a·many-to-many·relationship·between·an | 107 | _\x8b_\x8a_\x8s_\x8i_\x8c_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·-·Illustrate·a·many-to-many·relationship·between·an |
| 111 | “Order”·and·a·collection·of·“Item”·objects,·associating·a·purchase·price·with | 108 | “Order”·and·a·collection·of·“Item”·objects,·associating·a·purchase·price·with |
| 112 | each·via·an·association·object·called·“OrderItem” | 109 | each·via·an·association·object·called·“OrderItem” |
| 110 | _\x8p_\x8r_\x8o_\x8x_\x8i_\x8e_\x8d_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·-·Same·example·as·basic_association,·adding·in·usage·of | ||
| 111 | _\x8s_\x8q_\x8l_\x8a_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y_\x8._\x8e_\x8x_\x8t_\x8._\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8p_\x8r_\x8o_\x8x_\x8y·to·make·explicit·references·to·OrderItem | ||
| 112 | optional. | ||
| 113 | *\x8**\x8**\x8**\x8*·A\x8As\x8sy\x8yn\x8nc\x8ci\x8io\x8o·I\x8In\x8nt\x8te\x8eg\x8gr\x8ra\x8at\x8ti\x8io\x8on\x8n_\x8?\x8¶·*\x8**\x8**\x8**\x8* | 113 | *\x8**\x8**\x8**\x8*·A\x8As\x8sy\x8yn\x8nc\x8ci\x8io\x8o·I\x8In\x8nt\x8te\x8eg\x8gr\x8ra\x8at\x8ti\x8io\x8on\x8n_\x8?\x8¶·*\x8**\x8**\x8**\x8* |
| 114 | Examples·illustrating·the·asyncio·engine·feature·of·SQLAlchemy. | 114 | Examples·illustrating·the·asyncio·engine·feature·of·SQLAlchemy. |
| 115 | Listing·of·files: | 115 | Listing·of·files: |
| 116 | ····*·_\x8g_\x8a_\x8t_\x8h_\x8e_\x8r_\x8__\x8o_\x8r_\x8m_\x8__\x8s_\x8t_\x8a_\x8t_\x8e_\x8m_\x8e_\x8n_\x8t_\x8s_\x8._\x8p_\x8y·-·Illustrates·how·to·run·many·statements | ||
| 117 | ······concurrently·using·asyncio.gather()·along·many·asyncio·database | ||
| 118 | ······connections,·merging·ORM·results·into·a·single·AsyncSession. | ||
| 119 | _\x8a_\x8s_\x8y_\x8n_\x8c_\x8__\x8o_\x8r_\x8m_\x8._\x8p_\x8y·-·Illustrates·use·of·the·sqlalchemy.ext.asyncio.AsyncSession | 116 | ····*·_\x8a_\x8s_\x8y_\x8n_\x8c_\x8__\x8o_\x8r_\x8m_\x8._\x8p_\x8y·-·Illustrates·use·of·the·sqlalchemy.ext.asyncio.AsyncSession |
| 120 | object·for·asynchronous·ORM·use. | 117 | ······object·for·asynchronous·ORM·use. |
| 118 | _\x8g_\x8r_\x8e_\x8e_\x8n_\x8l_\x8e_\x8t_\x8__\x8o_\x8r_\x8m_\x8._\x8p_\x8y·-·Illustrates·use·of·the·sqlalchemy.ext.asyncio.AsyncSession | ||
| 119 | object·for·asynchronous·ORM·use,·including·the·optional·run_sync()·method. | ||
| 120 | _\x8g_\x8a_\x8t_\x8h_\x8e_\x8r_\x8__\x8o_\x8r_\x8m_\x8__\x8s_\x8t_\x8a_\x8t_\x8e_\x8m_\x8e_\x8n_\x8t_\x8s_\x8._\x8p_\x8y·-·Illustrates·how·to·run·many·statements·concurrently | ||
| 121 | using·asyncio.gather()·along·many·asyncio·database·connections,·merging·ORM | ||
| 122 | results·into·a·single·AsyncSession. | ||
| 121 | _\x8a_\x8s_\x8y_\x8n_\x8c_\x8__\x8o_\x8r_\x8m_\x8__\x8w_\x8r_\x8i_\x8t_\x8e_\x8o_\x8n_\x8l_\x8y_\x8._\x8p_\x8y·-·Illustrates·using·w\x8wr\x8ri\x8it\x8te\x8e·o\x8on\x8nl\x8ly\x8y·r\x8re\x8el\x8la\x8at\x8ti\x8io\x8on\x8ns\x8sh\x8hi\x8ip\x8ps\x8s·for·simpler | 123 | _\x8a_\x8s_\x8y_\x8n_\x8c_\x8__\x8o_\x8r_\x8m_\x8__\x8w_\x8r_\x8i_\x8t_\x8e_\x8o_\x8n_\x8l_\x8y_\x8._\x8p_\x8y·-·Illustrates·using·w\x8wr\x8ri\x8it\x8te\x8e·o\x8on\x8nl\x8ly\x8y·r\x8re\x8el\x8la\x8at\x8ti\x8io\x8on\x8ns\x8sh\x8hi\x8ip\x8ps\x8s·for·simpler |
| 122 | handling·of·ORM·collections·under·asyncio. | 124 | handling·of·ORM·collections·under·asyncio. |
| 123 | _\x8b_\x8a_\x8s_\x8i_\x8c_\x8._\x8p_\x8y·-·Illustrates·the·asyncio·engine·/·connection·interface. | 125 | _\x8b_\x8a_\x8s_\x8i_\x8c_\x8._\x8p_\x8y·-·Illustrates·the·asyncio·engine·/·connection·interface. |
| 124 | _\x8g_\x8r_\x8e_\x8e_\x8n_\x8l_\x8e_\x8t_\x8__\x8o_\x8r_\x8m_\x8._\x8p_\x8y·-·Illustrates·use·of·the·sqlalchemy.ext.asyncio.AsyncSession | ||
| 125 | object·for·asynchronous·ORM·use,·including·the·optional·run_sync()·method. | ||
| 126 | *\x8**\x8**\x8**\x8*·D\x8Di\x8ir\x8re\x8ec\x8ct\x8te\x8ed\x8d·G\x8Gr\x8ra\x8ap\x8ph\x8hs\x8s_\x8?\x8¶·*\x8**\x8**\x8**\x8* | 126 | *\x8**\x8**\x8**\x8*·D\x8Di\x8ir\x8re\x8ec\x8ct\x8te\x8ed\x8d·G\x8Gr\x8ra\x8ap\x8ph\x8hs\x8s_\x8?\x8¶·*\x8**\x8**\x8**\x8* |
| 127 | An·example·of·persistence·for·a·directed·graph·structure.·The·graph·is·stored | 127 | An·example·of·persistence·for·a·directed·graph·structure.·The·graph·is·stored |
| 128 | as·a·collection·of·edges,·each·referencing·both·a·“lower”·and·an·“upper”·node | 128 | as·a·collection·of·edges,·each·referencing·both·a·“lower”·and·an·“upper”·node |
| 129 | in·a·table·of·nodes.·Basic·persistence·and·querying·for·lower-·and·upper- | 129 | in·a·table·of·nodes.·Basic·persistence·and·querying·for·lower-·and·upper- |
| 130 | neighbors·are·illustrated: | 130 | neighbors·are·illustrated: |
| 131 | n2·=·Node(2) | 131 | n2·=·Node(2) |
| 132 | n5·=·Node(5) | 132 | n5·=·Node(5) |
| Offset 148, 27 lines modified | Offset 148, 27 lines modified | ||
| 148 | Supplier,·both·subclassing·the·HasAddresses·mixin,·which·ensures·that·the | 148 | Supplier,·both·subclassing·the·HasAddresses·mixin,·which·ensures·that·the |
| 149 | parent·class·is·provided·with·an·addresses·collection·which·contains·Address | 149 | parent·class·is·provided·with·an·addresses·collection·which·contains·Address |
| 150 | objects. | 150 | objects. |
| 151 | The·_\x8d_\x8i_\x8s_\x8c_\x8r_\x8i_\x8m_\x8i_\x8n_\x8a_\x8t_\x8o_\x8r_\x8__\x8o_\x8n_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·and·_\x8g_\x8e_\x8n_\x8e_\x8r_\x8i_\x8c_\x8__\x8f_\x8k_\x8._\x8p_\x8y·scripts·are·modernized | 151 | The·_\x8d_\x8i_\x8s_\x8c_\x8r_\x8i_\x8m_\x8i_\x8n_\x8a_\x8t_\x8o_\x8r_\x8__\x8o_\x8n_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·and·_\x8g_\x8e_\x8n_\x8e_\x8r_\x8i_\x8c_\x8__\x8f_\x8k_\x8._\x8p_\x8y·scripts·are·modernized |
| 152 | versions·of·recipes·presented·in·the·2007·blog·post·_\x8P_\x8o_\x8l_\x8y_\x8m_\x8o_\x8r_\x8p_\x8h_\x8i_\x8c_\x8·_\x8A_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8s | 152 | versions·of·recipes·presented·in·the·2007·blog·post·_\x8P_\x8o_\x8l_\x8y_\x8m_\x8o_\x8r_\x8p_\x8h_\x8i_\x8c_\x8·_\x8A_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8s |
| 153 | _\x8w_\x8i_\x8t_\x8h_\x8·_\x8S_\x8Q_\x8L_\x8A_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y. | 153 | _\x8w_\x8i_\x8t_\x8h_\x8·_\x8S_\x8Q_\x8L_\x8A_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y. |
| 154 | Listing·of·files: | 154 | Listing·of·files: |
| 155 | ····*·_\x8t_\x8a_\x8b_\x8l_\x8e_\x8__\x8p_\x8e_\x8r_\x8__\x8r_\x8e_\x8l_\x8a_\x8t_\x8e_\x8d_\x8._\x8p_\x8y·-·Illustrates·a·generic·association·which·persists | ||
| 156 | ······association·objects·within·individual·tables,·each·one·generated·to | ||
| 157 | ····· | 155 | ····*·_.d_.i_.s_.c_.r_.i_.m_.i_.n_.a_.t_.o_.r_.__.o_.n_.__.a_.s_.s_.o_.c_.i_.a_.t_.i_.o_.n_.._.p_.y·-·Illustrates·a·mixin·which·provides·a |
| 156 | ······generic·association·using·a·single·target·table·and·a·single·association | ||
| 157 | ······table,·referred·to·by·all·parent·tables.·The·association·table·contains·a | ||
| 158 | ······“discriminator”·column·which·determines·what·type·of·parent·object | ||
| 159 | ······associates·to·each·particular·row·in·the·association·table. | ||
| 158 | _\x8g_\x8e_\x8n_\x8e_\x8r_\x8i_\x8c_\x8__\x8f_\x8k_\x8._\x8p_\x8y·-·Illustrates·a·so-called·“generic·foreign·key”,·in·a·similar | 160 | _\x8g_\x8e_\x8n_\x8e_\x8r_\x8i_\x8c_\x8__\x8f_\x8k_\x8._\x8p_\x8y·-·Illustrates·a·so-called·“generic·foreign·key”,·in·a·similar |
| 159 | fashion·to·that·of·popular·frameworks·such·as·Django,·ROR,·etc.·This·approach | 161 | fashion·to·that·of·popular·frameworks·such·as·Django,·ROR,·etc.·This·approach |
| 160 | bypasses·standard·referential·integrity·practices,·in·that·the·“foreign·key” | 162 | bypasses·standard·referential·integrity·practices,·in·that·the·“foreign·key” |
| 161 | column·is·not·actually·constrained·to·refer·to·any·particular·table;·instead, | 163 | column·is·not·actually·constrained·to·refer·to·any·particular·table;·instead, |
| 162 | in-application·logic·is·used·to·determine·which·table·is·referenced. | 164 | in-application·logic·is·used·to·determine·which·table·is·referenced. |
| 165 | _\x8t_\x8a_\x8b_\x8l_\x8e_\x8__\x8p_\x8e_\x8r_\x8__\x8r_\x8e_\x8l_\x8a_\x8t_\x8e_\x8d_\x8._\x8p_\x8y·-·Illustrates·a·generic·association·which·persists | ||
| 166 | association·objects·within·individual·tables,·each·one·generated·to·persist | ||
| 167 | those·objects·on·behalf·of·a·particular·parent·class. | ||
| 163 | _\x8d_\x8i_\x8s_\x8c_\x8r_\x8i_\x8m_\x8i_\x8n_\x8a_\x8t_\x8o_\x8r_\x8__\x8o_\x8n_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·-·Illustrates·a·mixin·which·provides·a·generic | ||
| 164 | association·using·a·single·target·table·and·a·single·association·table, | ||
| 165 | referred·to·by·all·parent·tables.·The·association·table·contains·a | ||
| 166 | “discriminator”·column·which·determines·what·type·of·parent·object·associates | ||
| 167 | to·each·particular·row·in·the·association·table. | ||
| 168 | _\x8t_\x8a_\x8b_\x8l_\x8e_\x8__\x8p_\x8e_\x8r_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·-·Illustrates·a·mixin·which·provides·a·generic | 168 | _\x8t_\x8a_\x8b_\x8l_\x8e_\x8__\x8p_\x8e_\x8r_\x8__\x8a_\x8s_\x8s_\x8o_\x8c_\x8i_\x8a_\x8t_\x8i_\x8o_\x8n_\x8._\x8p_\x8y·-·Illustrates·a·mixin·which·provides·a·generic |
| 169 | association·via·a·individually·generated·association·tables·for·each·parent | 169 | association·via·a·individually·generated·association·tables·for·each·parent |
| 170 | class.·The·associated·objects·themselves·are·persisted·in·a·single·table·shared | 170 | class.·The·associated·objects·themselves·are·persisted·in·a·single·table·shared |
| 171 | among·all·parents. | 171 | among·all·parents. |
| 172 | *\x8**\x8**\x8**\x8*·M\x8Ma\x8at\x8te\x8er\x8ri\x8ia\x8al\x8li\x8iz\x8ze\x8ed\x8d·P\x8Pa\x8at\x8th\x8hs\x8s_\x8?\x8¶·*\x8**\x8**\x8**\x8* | 172 | *\x8**\x8**\x8**\x8*·M\x8Ma\x8at\x8te\x8er\x8ri\x8ia\x8al\x8li\x8iz\x8ze\x8ed\x8d·P\x8Pa\x8at\x8th\x8hs\x8s_\x8?\x8¶·*\x8**\x8**\x8**\x8* |
| 173 | Illustrates·the·“materialized·paths”·pattern·for·hierarchical·data·using·the | 173 | Illustrates·the·“materialized·paths”·pattern·for·hierarchical·data·using·the |
| 174 | SQLAlchemy·ORM. | 174 | SQLAlchemy·ORM. |
| Offset 220, 28 lines modified | Offset 220, 29 lines modified | ||
| 220 | $·python·-m·examples.performance·bulk_inserts·\ | 220 | $·python·-m·examples.performance·bulk_inserts·\ |
| 221 | ····--dburl·mysql+mysqldb://scott:tiger@localhost/test·\ | 221 | ····--dburl·mysql+mysqldb://scott:tiger@localhost/test·\ |
| 222 | ····--profile·--num·1000 | 222 | ····--profile·--num·1000 |
| 223 | See·also | 223 | See·also |
| 224 | _\x8H_\x8o_\x8w_\x8·_\x8c_\x8a_\x8n_\x8·_\x8I_\x8·_\x8p_\x8r_\x8o_\x8f_\x8i_\x8l_\x8e_\x8·_\x8a_\x8·_\x8S_\x8Q_\x8L_\x8A_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y_\x8·_\x8p_\x8o_\x8w_\x8e_\x8r_\x8e_\x8d_\x8·_\x8a_\x8p_\x8p_\x8l_\x8i_\x8c_\x8a_\x8t_\x8i_\x8o_\x8n_\x8? | 224 | _\x8H_\x8o_\x8w_\x8·_\x8c_\x8a_\x8n_\x8·_\x8I_\x8·_\x8p_\x8r_\x8o_\x8f_\x8i_\x8l_\x8e_\x8·_\x8a_\x8·_\x8S_\x8Q_\x8L_\x8A_\x8l_\x8c_\x8h_\x8e_\x8m_\x8y_\x8·_\x8p_\x8o_\x8w_\x8e_\x8r_\x8e_\x8d_\x8·_\x8a_\x8p_\x8p_\x8l_\x8i_\x8c_\x8a_\x8t_\x8i_\x8o_\x8n_\x8? |
| 225 | *\x8**\x8**\x8*·F\x8Fi\x8il\x8le\x8e·L\x8Li\x8is\x8st\x8ti\x8in\x8ng\x8g_\x8?\x8¶·*\x8**\x8**\x8* | 225 | *\x8**\x8**\x8*·F\x8Fi\x8il\x8le\x8e·L\x8Li\x8is\x8st\x8ti\x8in\x8ng\x8g_\x8?\x8¶·*\x8**\x8**\x8* |
| 226 | Listing·of·files: | 226 | Listing·of·files: |
| 227 | ····*·_\x8b_\x8u_\x8l_\x8k_\x8__\x8u_\x8p_\x8d_\x8a_\x8t_\x8e_\x8s_\x8._\x8p_\x8y·-·This·series·of·tests·will·illustrate·different·ways·to | ||
| 228 | ······UPDATE·a·large·number·of·rows·in·bulk·(under·construction!·there’s·just | ||
| 229 | ······one·test·at·the·moment) | ||
| 230 | _.s_.i_.n_.g_.l_.e_.__.i_.n_.s_.e_.r_.t_.s_.._.p_.y·-·In·this·series·of·tests,·we’re·looking·at·a·method | 227 | ····*·_.s_.i_.n_.g_.l_.e_.__.i_.n_.s_.e_.r_.t_.s_.._.p_.y·-·In·this·series·of·tests,·we’re·looking·at·a·method |
| 231 | inserts·a·row·within·a·distinct·transaction,·and·afterwards·returns | 228 | ······that·inserts·a·row·within·a·distinct·transaction,·and·afterwards·returns |
| 232 | essentially·a·“closed”·state.·This·would·be·analogous·to·an·API·call | 229 | ······to·essentially·a·“closed”·state.·This·would·be·analogous·to·an·API·call |
| 233 | starts·up·a·database·connection,·inserts·the·row,·commits·and | 230 | ······that·starts·up·a·database·connection,·inserts·the·row,·commits·and |
| 231 | ······closes. | ||
| 232 | _\x8s_\x8h_\x8o_\x8r_\x8t_\x8__\x8s_\x8e_\x8l_\x8e_\x8c_\x8t_\x8s_\x8._\x8p_\x8y·-·This·series·of·tests·illustrates·different·ways·to·SELECT·a | ||
| 233 | single·record·by·primary·key | ||
| 234 | _\x8b_\x8u_\x8l_\x8k_\x8__\x8i_\x8n_\x8s_\x8e_\x8r_\x8t_\x8s_\x8._\x8p_\x8y·-·This·series·of·tests·illustrates·different·ways·to·INSERT·a | 234 | _\x8b_\x8u_\x8l_\x8k_\x8__\x8i_\x8n_\x8s_\x8e_\x8r_\x8t_\x8s_\x8._\x8p_\x8y·-·This·series·of·tests·illustrates·different·ways·to·INSERT·a |
| 235 | large·number·of·rows·in·bulk. | 235 | large·number·of·rows·in·bulk. |
| 236 | _\x8b_\x8u_\x8l_\x8k_\x8__\x8u_\x8p_\x8d_\x8a_\x8t_\x8e_\x8s_\x8._\x8p_\x8y·-·This·series·of·tests·will·illustrate·different·ways·to·UPDATE | ||
| 237 | a·large·number·of·rows·in·bulk·(under·construction!·there’s·just·one·test·at | ||
| 238 | the·moment) | ||
| 239 | _\x8__\x8__\x8m_\x8a_\x8i_\x8n_\x8__\x8__\x8._\x8p_\x8y·-·Allows·the·examples/performance·package·to·be·run·as·a·script. | ||
| 236 | _\x8l_\x8a_\x8r_\x8g_\x8e_\x8__\x8r_\x8e_\x8s_\x8u_\x8l_\x8t_\x8s_\x8e_\x8t_\x8s_\x8._\x8p_\x8y·-·In·this·series·of·tests,·we·are·looking·at·time·to·load·a | 240 | _\x8l_\x8a_\x8r_\x8g_\x8e_\x8__\x8r_\x8e_\x8s_\x8u_\x8l_\x8t_\x8s_\x8e_\x8t_\x8s_\x8._\x8p_\x8y·-·In·this·series·of·tests,·we·are·looking·at·time·to·load·a |
| 237 | large·number·of·very·small·and·simple·rows. | 241 | large·number·of·very·small·and·simple·rows. |
| 238 | _\x8__\x8__\x8m_\x8a_\x8i_\x8n_\x8__\x8__\x8._\x8p_\x8y·-·Allows·the·examples/performance·package·to·be·run·as·a·script. | ||
| 239 | _\x8s_\x8h_\x8o_\x8r_\x8t_\x8__\x8s_\x8e_\x8l_\x8e_\x8c_\x8t_\x8s_\x8._\x8p_\x8y·-·This·series·of·tests·illustrates·different·ways·to·SELECT·a | ||
| 240 | single·record·by·primary·key | ||
| 241 | *\x8**\x8**\x8*·R\x8Ru\x8un\x8nn\x8ni\x8in\x8ng\x8g·a\x8al\x8ll\x8l·t\x8te\x8es\x8st\x8ts\x8s·w\x8wi\x8it\x8th\x8h·t\x8ti\x8im\x8me\x8e_\x8?\x8¶·*\x8**\x8**\x8* | 242 | *\x8**\x8**\x8*·R\x8Ru\x8un\x8nn\x8ni\x8in\x8ng\x8g·a\x8al\x8ll\x8l·t\x8te\x8es\x8st\x8ts\x8s·w\x8wi\x8it\x8th\x8h·t\x8ti\x8im\x8me\x8e_\x8?\x8¶·*\x8**\x8**\x8* |
| 242 | This·is·the·default·form·of·run: | 243 | This·is·the·default·form·of·run: |
| 243 | $·python·-m·examples.performance·single_inserts | 244 | $·python·-m·examples.performance·single_inserts |
| 244 | Tests·to·run:·test_orm_commit,·test_bulk_save, | 245 | Tests·to·run:·test_orm_commit,·test_bulk_save, |
| 245 | ··············test_bulk_insert_dictionaries,·test_core, | 246 | ··············test_bulk_insert_dictionaries,·test_core, |
| 246 | ··············test_core_query_caching,·test_dbapi_raw_w_connect, | 247 | ··············test_core_query_caching,·test_dbapi_raw_w_connect, |
| 247 | ··············test_dbapi_raw_w_pool | 248 | ··············test_dbapi_raw_w_pool |
| Offset 472, 27 lines modified | Offset 473, 27 lines modified | ||
| 472 | Several·examples·that·illustrate·the·technique·of·intercepting·changes·that | 473 | Several·examples·that·illustrate·the·technique·of·intercepting·changes·that |
| 473 | would·be·first·interpreted·as·an·UPDATE·on·a·row,·and·instead·turning·it·into | 474 | would·be·first·interpreted·as·an·UPDATE·on·a·row,·and·instead·turning·it·into |
| 474 | an·INSERT·of·a·new·row,·leaving·the·previous·row·intact·as·a·historical | 475 | an·INSERT·of·a·new·row,·leaving·the·previous·row·intact·as·a·historical |
| 475 | version. | 476 | version. |
| 476 | Compare·to·the·_\x8V_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8i_\x8n_\x8g_\x8·_\x8w_\x8i_\x8t_\x8h_\x8·_\x8a_\x8·_\x8H_\x8i_\x8s_\x8t_\x8o_\x8r_\x8y_\x8·_\x8T_\x8a_\x8b_\x8l_\x8e·example·which·writes·a·history | 477 | Compare·to·the·_\x8V_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8i_\x8n_\x8g_\x8·_\x8w_\x8i_\x8t_\x8h_\x8·_\x8a_\x8·_\x8H_\x8i_\x8s_\x8t_\x8o_\x8r_\x8y_\x8·_\x8T_\x8a_\x8b_\x8l_\x8e·example·which·writes·a·history |
| 477 | row·to·a·separate·history·table. | 478 | row·to·a·separate·history·table. |
| 478 | Listing·of·files: | 479 | Listing·of·files: |
| 479 | ····*·_\x8v_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8e_\x8d_\x8__\x8m_\x8a_\x8p_\x8._\x8p_\x8y·-·A·variant·of·the·versioned_rows·example·built·around | ||
| 480 | ······the·concept·of·a·“vertical·table”·structure,·like·those·illustrated·in | ||
| 481 | ······_\x8V_\x8e_\x8r_\x8t_\x8i_\x8c_\x8a_\x8l_\x8·_\x8A_\x8t_\x8t_\x8r_\x8i_\x8b_\x8u_\x8t_\x8e_\x8·_\x8M_\x8a_\x8p_\x8p_\x8i_\x8n_\x8g·examples. | ||
| 482 | _\x8v_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8e_\x8d_\x8__\x8r_\x8o_\x8w_\x8s_\x8._\x8p_\x8y·-·Illustrates·a·method·to·intercept·changes·on·objects, | 480 | ····*·_\x8v_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8e_\x8d_\x8__\x8r_\x8o_\x8w_\x8s_\x8._\x8p_\x8y·-·Illustrates·a·method·to·intercept·changes·on·objects, |
| 483 | turning·an·UPDATE·statement·on·a·single·row·into·an·INSERT·statement,·so | 481 | ······turning·an·UPDATE·statement·on·a·single·row·into·an·INSERT·statement,·so |
| 484 | new·row·is·inserted·with·the·new·data,·keeping·the·old·row·intact. | ||
| 485 | _\x8v_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8e_\x8d_\x8__\x8r_\x8o_\x8w_\x8s_\x8__\x8w_\x8__\x8v_\x8e_\x8r_\x8s_\x8i_\x8o_\x8n_\x8i_\x8d_\x8._\x8p_\x8y·-·Illustrates·a·method·to·intercept·changes·on | ||
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